[英]kotlin Generic type function as parameters
i stuck in some problems about the generic
type in kotlin.我在 kotlin 中遇到了一些关于generic
类型的问题。 Originally,i want to call the function with the value and the recall-function.最初,我想用值和召回功能调用 function。 So i write that below, but the value only allows me pass a type like string/Int somethings like that.所以我在下面写了这个,但是这个值只允许我传递一个像 string/Int 这样的类型。 I want to pass a function as parameter in the recall function.我想在召回 function 中传递一个 function 作为参数。
ClassA A类
ClassA<T>{
var canCancel: Boolean = true
var recallFunction: (() -> T)? = null
var recallFunctionWithValue: ((value: T) -> Unit)? = null
var context: Context? = null
var value: T? = null
var functionPara :( ()->T)? = null
var recallFunctionWithFunction:((()->T) -> Unit)? = null
constructor(context: Context?, canCancel: Boolean, value: T, recallFunctionWithValue: (value: T) -> Unit) {
this.context = context
this.canCancel = canCancel
this.value = value
this.recallFunctionWithValue = recallFunctionWithValue
}
}
ClassB B类
ClassA(ctx, true,viewModel!!::testRefInside,viewModel!!::testRefOutside).createNativeNetworkDialog()
ViewModel视图模型
fun testRefOutside(test: Observable<Any>? ){
}
fun testRefInside():Observable<Any>?{
return null
}
i try to do something like that我试着做这样的事情
var canCancel: Boolean = true
var recallFunction: (() -> T)? = null
var recallFunctionWithValue: ((value: T) -> Unit)? = null
var context: Context? = null
var value: T? = null
var functionPara :( ()->T)? = null
var recallFunctionWithFunction:((()->T) -> Unit)? = null
constructor(context: Context?, canCancel: Boolean, value: () -> T, recallFunctionWithValue: (value: ()->T) -> Unit) {
this.context = context
this.canCancel = canCancel
this.functionPara = value
this.recallFunctionWithFunction = recallFunctionWithValue
}
but it shows the syntax error.但它显示语法错误。 Can someone help?有人可以帮忙吗?
Syntax Error语法错误
Error show in this place only RYEasyDialog means ClassA错误显示在这个地方只有 RYEasyDialog 表示 ClassA
It works!!有用!! now现在
var recallFunctionWithFunction:((value: T) -> Unit)? = null
constructor(context: Context?, canCancel: Boolean, value: () -> T, recallFunctionWithValue: (value: T) -> Unit) {
this.context = context
this.canCancel = canCancel
this.functionPara = value
this.recallFunctionWithFunction = recallFunctionWithValue
8/6 Updated Vararg problems 8/6 更新Vararg 问题
I am doing something in advanced.我正在做一些高级的事情。 I just post it in completed code.我只是将其发布在完整的代码中。 If i don't use vararg, the如果我不使用可变参数,则
EasyDialog<Observable<Any>,LiveData<Boolean>>(ctx, true,viewModel!!::callGetTeammateListAPITEST,recallFunctionWithFunction = viewModel!!::callMultipleAPI).createNativeNetworkDialog2()
without casting as ((Observable<Any>)->LiveData<Boolean>)
.but the callMuipleApi receives vararg parameter, i have to cast it into as ((Observable)->LiveData) but i it doesn't show any error but the function callmutipleapi and callgetteammateslist in not called.没有转换as ((Observable<Any>)->LiveData<Boolean>)
。但是 callMuipleApi 接收可变参数参数,我必须将其转换为 ((Observable)->LiveData) 但我没有显示任何错误但是function callmutilpleapi 和 callgetteammateslist 在没有被调用。 can anyone help?谁能帮忙?
ViewModel视图模型
fun callMultipleAPI( vararg observable: Observable<Any>):LiveData<Boolean>{
if(progressDialogData==null){
progressDialogData= MutableLiveData()
}
progressDialogData?.setValue(true)
repo.callMultipleAPI<Any>(*observable, observer = RYEasyObserver(object : RyObserverSingleStatusListener<List<Any>> {
override fun onNext(g: List<Any>) {
Log.d("test",g.toString())
for(model in g){
when(model){
is GetTeammateListModel ->{setCallGetTeammateListResponse(model)}
is GetTeamListModel ->{setCallGetTeamListResponse(model)}
is GetMessageSumModel->{setCallGetMessageSumResponse(model)}
is GetCallModel->{setCallGetResponse(model)}
}
}
progressDialogData?.setValue(false)
}
override fun onError() {
progressDialogData?.setValue(false)
}
},true))
return progressDialogData!!
}
Fragment分段
EasyDialog<Observable<Any>,LiveData<Boolean>>(ctx, true,viewModel!!::callGetTeammateListAPITEST,recallFunctionWithFunction = viewModel!!::callMultipleAPI as ((Observable<Any>)->LiveData<Boolean>)).createNativeNetworkDialog2()
EasyDialog易对话
class EasyDialog<T,V> {
var canCancel: Boolean = true
var recallFunction: (() -> T)? = null
var recallFunctionWithValue: ((value: T) -> Unit)? = null
var context: Context? = null
var value: T? = null
var functionPara :(()->T)? = null
var recallFunctionWithFunction:((T) -> V)? = null
constructor(
context: Context?, canCancel: Boolean, value: ()->T, recallFunctionWithFunction: (T) -> V ){
this.context = context
this.canCancel = canCancel
this.functionPara = value
this.recallFunctionWithFunction = recallFunctionWithFunction
}
fun createNativeNetworkDialog2() {
val builder = AlertDialog.Builder(context)
if (!canCancel) {
builder.setCancelable(false)
} else {
builder.setNegativeButton(context?.resources?.getString(R.string.gloda_cancel)) { dialogInterface, id -> }
}
builder.setMessage(context?.resources?.getString(R.string.global_network_error))
builder.setPositiveButton(context?.resources?.getString(R.string.global_retry)) { dialog, id ->
recallFunction?.invoke()
value?.let { it1 -> recallFunctionWithValue?.invoke(it1) }
//functionPara?.let { it2->recallFunctionWithFunction?.invoke(it2) }
functionPara?.let{ functionPara->{ recallFunctionWithFunction?.let {
recallFunctionWithFunction-> compose<T,V>(recallFunctionWithFunction ,functionPara).invoke()
}}}
}
val dialog = builder.create()
dialog.show()
}
fun <T, V> compose( f: (T) -> V, g:() -> T ): () -> V {
return { f(g()) }
}
The last constructor parameter is最后一个构造函数参数是
(() -> T) -> Unit
Based on what you pass for the third constructor paramter, T
is inferred to be Observable<Any>?
根据您为第三个构造函数参数传递的内容, T
被推断为Observable<Any>?
. . so it is expecting a所以它期待一个
(() -> Observable<Any>?) -> Unit
but testRefOutside
is但testRefOutside
是
Observable<Any>? -> Unit
I'm guessing you probably didn't mean to define a third-order function by making the input of your function another function.我猜你可能不是想通过将 function 的输入设为另一个 function 来定义三阶 function。
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